Tell-tale flexible staybolt



Feb-28, 1933- F. H.E|NwAEcHTER,JR.,E1-AL 1,899,457

TELL-TALE FLEXIBLE STAYBOLT Filed Jan. 20, 1931 2 Sheets-Sheet l 1N VENT ORS,`

ATTORNEY Feb.' 28, 1933.`

F. H.- EINWAECHTER, JR., ET AL TELL-TALE FLEXIBLE STAYBOLT 2 Sheets-Sheet 2 Filed Jari. 2OI 1931 sl.. vili 8/" l vENToRs,

ATTORNEY j Wy/MOVIL., 1&6@ faan@ as.; 28,1 193e* f y `Fmarmeren Inf-mmm locomotive.andgtheLnecessityofstrip carence.; beweise MEHORREANI) ALBERT'Eg-Alverfaior. y w 'fzqnnpamimnxynanxmmn; Y, A ,5:1 v op f s TELL-TALEmmeeglsmraow Under* the? Interstatefemmer G Ommisygsionrulesyit is Il'equired thatall'lexiblestayi "bolts havingcapsioverthe outerends shall havethe capsgremovedjat least once everyjtvvmy (2)"v years andthe bolts and"sleeves exa'mined f y y y y assura-nce" thatl the yholejfis drilledyaccuratelyf `in -theacenter,fs`o}that faultygbolts are liable to to befproducediandputqnto-usegqV Ordinaril-yyy y r`for breakage, exceptincasesvvhereftheboltis igwprovided with tellftazlehole notf-l'essfthan three-sixteenths '(g'ffof'fan inch-nor more than seven thirty-seconds (glad/of i any inch ,inV i diameter, extendingY the entire-f,lengthofthe boltfand intothe headnot'less vthan one-third of its diametegpand these holes are"Lplrp-.S-v Y d; from beingy closed; byffcopper plating Y or .other approved method; 'andare 1 opened andy tested, each tir`ne(at4 least yearly) thev y151.4 (if) 'teet'e hydrostatic testis applied,vvith an=electrical 29;: or `f otherfinstrument' approved Qby' vthe bureau f 'of locomotive inspection, that -fvvill positively indicate. When the tell-tale holesfare openV their 'entire length, s in `jvvhioh cases the *capS will not: be required ylto Y bieremovedf; VVhenjA s 2Q this electrical indicating rtestis completedthej-j; hydrostatic testrmustbeapplied and all-stayv ovv leakage ythrough bolts removed "which theTt'ell-t'ale hole'.` y c The Interstate Commerce yCommission Bojulesfurther require that'the inner endsof j v"the" telltale holes "mustbe keptclosed 4vvith a fire-proof porous-,material thatfwi'll kexclude foreign s matter andv permitleakage of l steam or ivvater, if the Aboltfisbrokengor fractured, e telletale hole, and thatA when this test Sainte@ s Visfcompleted,fthe ends of the telltale-holes, must be closed Withg materialiy of different color from tlllatnl removed'y and l3arecordkept, ofjcol'ors used...

e. In, @dem av@ andtimefconsum Y caps of, lthe .large n ping-the eiregre-bexsof 'theia@lieti/lagging;vriiiee,y 4@ etclg l 4 froml service Vseveral Edays each; timethel caps Y spie ference; to Lstayjbolt's l' ofj "d ,thjtrpubieseme ,tedioufsgflng Work uof removing'the number. of ffstayb olts on y' a l andy the y i Withdrawal `of thel ylocomotive t be removed and "the l'staybolts inspected?,

'Y quirementfabovefnotedQthatris, va telll'taleehol'efkh f staygbolts vare 'diilicult rto make one account of drilling lthe small hole l, into; the head'f` and#l A treatment ofthe tell-tale hole, andthere 'is' no thistype of. boltyemploys asolid or screwed?" onyspherical head fitted 'to `turn in al casing` f consisting ofa'sleeve' and cap, the cap being;

any; le akage Wl'iichmay" occur betvveengthfe f 'tion lor'wearofthese-fparts or imperfections causingimperfect seating;v s f Qneobj ection tosuch constructiony of flexibletellitalestaybolts is that iny riveting downi-V thefinner endlof'thebolt-the tell-tale hole-isf` liable vto .be c losed.` r n Inxsuclr eventethehole i inust "be reained 'out-,cleaned by means` offan 1 air'jcleanerA forvremeval o'fy` chips and-other yforeign particles, andy all such ,telltale holes tested-bvmeansof; an `electrical testing tool f suchffasbefore referred to Whichfindicatesby- :7 electric-v contact andi the operation of a; sign-al When the hole is entirely cleary and :clean-.1* Another obj ection tov suchy construction yof flexibletelltale stayboltfsV is kthat --in oase of'l' yleakage l-atgthey outer end of the 'bolt itis iin-` r'solelyjto a faulty lseat or toa break inthe bolt,4 8

or-both, and therefore fit'isf diiiicultjtoftell?" fwhat Work is necessary to remedy thedi-flic Sti'llanfother Jobject-icute suchflexibletell?y tale bolts is that between inspections fracture-@19 ofwater, ysteam vtlfirough' theporous'elo-Ky isure,and the tell-,tale holes of such-bolts may become cloggedv with bolerscale-'sol that lno designed; Way.; Zhen this occurs-it eis' "neces-l A'saryfto clean out--'theftellf-tale holes ""offa'l'lf clogged "bolts and'lf'tog electrically test #the same' bymeans of an electrical testj'toolt as of "blind 'characterextending from itsv'inf'k A `nerendtofa-pointinfits headfportionlnear-its f vopposite or outer end, from whichpointout-g; Ward; the hole' is"5fblind` orf-closed. These 55 v 1 especi-allyfdesignedto closethecasing-against` 65 f heaQd andlit's Vseatfdue to expansion,v contrae-x ypossible totelllvvh'ethersuch leakage yis due 1 o t y of a,stayboltjmayfoccurlwhiohiwillnot be ini, Y dicaltedin the 'manneri relied upon vby:leakage1` 1 95 n lindication of thebrealrcan hegiveninl the f 'whether orV not their tell-tale holes arey cleaned, all bolts not showing clean bolt holes must be removed. All bolts which have successfully undergone the clean tell-tale holetest mustthen be'tested for .breaks or frac-4 tures by applying water pressure to the `boiler, the tell-tale holes closed by porousplugs,

of different color from those previouslyused-, and elaborate records of all such tests kept; and all bolts indicating by leakage, .breaks or fractures into the moved.. Y 7.7-

Asa resultof the several objections abovementioned flexible V.tell-tale staybolts of the n type in general use Vare comparatively expensive to install and to mkaintain'in serviceable condition, andthe difficult and tedious inspection work required encourages faulty in-` spection work and necessitates the withj l 1 drawal of thefloconrotive from service for a considerable period each time general inspecf tion land repairs are made.l

the use of a tell-tale holeof peep-sight type, orV one extending continuously therethrough, so that breaks or fractures will be at onceindicated by leakage Vof steam or wa ter at one end or the otherend of the bolt; so that the condition of the tell-tale hole may at allftimes be determined by visual inspection, i.- e., by daylightor other light test' and looking through the tell-tale hole or by means of a rod; and so that cleaning of the tell-tale hole may Ibe performedin an yeasy and rapid manner and without the usc of complenv tools.

A further obj ect of the inventionis to provide apconstruction of bolt head and casing and joint-closing means effecting a sealing :connection therebetween, whereby `an open Y' instead of a closed type of casing may be employed to permit escape of steam or water for break or fracture indication at the outer end of the bolt, as well as at the inner end thereof,

' while at the same time normally maintaining a tight steam and water tight joint between the head and casing.`

In another application, filed of even date herewith, Serial No. 509,997, we have shown the principles of .our invention applied to a bolt head casing arranged and welded on the outer side oftherouter boiler sheet and in which casing an outer seat for the head is formed, the inner seat for-the head being .formed by thefwall'of the bolt opening in such boiler sheet. Y

In the present application wek have shown the principles ofour invention applied to a staybolt having a sleeve and Vcap form of casing in which the sleeve is fitted in an opening in an outer boiler sheet and is provided with tell-taleholes, must here` A f e form of staybolt embodying ourinvention approper.

`fied form of bolt. A

- Fig. 10.

inner vand outer seats for the head. In both applications the outer wall of the casing is provided, in accordance with our invention, with an opening exposing the tell-tale hole atthe outerV endA of the bolt and through plied to -boiler sheets.

Fig. 2 is an outer end elevation of thebolt with casing applied.

Fig; 3 is an outer end elevation of the bolt Fig.V 4 is la side elevation of the bolt. t Fig is a bottomplan view of the bushing or outerjbolt head section. p Y

@Figa 6 nis a sectional side elevation of the Y same. The main object of our invention isto provide a staybolt so constructed as to allow of F ig. 7 is a plan view bof the washer., v

Fig. is a viewsimilar to Fig. 6 of the gasket. l F ig. :9 is.a.longitudinalfsection showing a Fig. 10 is a longitudinal section showing a modified `construction of casing and a modi- Fig. l1 "is a'section on the line ll-ll of Fig. l0.V j Y Fig. l2is a sectional side elevation of the inner bolt head orhead member shown in Fig. `13 is a sectional side elevation of another modified form of casing.v

` Fig. 14. is a sectional view through the bolt and casing showing the use of the casing of Fig. 13 and a coiled spring and washer structure conforming kto Fig. l.

' Fig. 15is a sectional view showing another nodified form of bushing or outer head mem- Fig. `16 is a longitudinalsection showing the use of a coil spring instead of a `plate spring in the structureof Figs. l() and 11.

Referringnow more particularlylto the drawings, and especially to Figs. 1 to 8, inelusive, 1 and 2 respoctivelydesignate the inner and-outer sheets of a fire-bo1r or kother portion of a boiler. Inv the sheet lisathreaded opening?) in whichis fitted` and through which extends the inner threaded end l of the `bolt 5, a projecting portion of which end 4,

member 7, which. is arranged at the point of bolt with separately formed end extension ap- Y 'plied thereto. Y

CTI

one or the other of the'ends of the bolt. 'Assuming, however, that a fracture should occur Vand scale enter and 'clog thebolt, this condition may bedetermined either by sight test orby the introduction ofV a suitable in-v strument, and the tell-tale hole may be Vquickly cleared and such conditionfdetermined and an indication of the nature of the trouble obtained, without'the use offthe complex instrumentalities and the expenditure of the great amount of time and labor commonly required. As suchconstruction and clearing` tests may beeasily and conveniently made,

' the tests may be conducted if desired at much Y v K more frequent intervals than required'byInterstate Commerce Commission rules, or isV customary, and the boiler keptin better' and saferrconditio'n without the expense 1n time V.and labor and withdrawal of the locomotive shown in Fig.,9 the bolt passage 15a in theV from service as experienced with convene tional staybolts in` present practice. This improved construction of staybolt combines all the advantages of the rigid hollow staybolt with the tell-tale hole with the `advantages of the flexible type, whiley overcoming the stated and other well known disadvantages of the ordinary rigid and conventiona types of iiexible staybolts; c

The construction of the staybolt maybe Vmodified in many and various ways within the spirit and scope of our invention. As

sleeve may be Vtapered and, in addition: to the soft metal washer 21, one or more shim-` like additional* washers 21E may be em-V ployed. Fig. 9 also shows the `use of aseparately formed end extension 8a which may be s threaded and welded or otherwise xed to the bolt shank, this construction allowing conventional stock bolts to be converted at slight expenseinto bolts with extensions adapted A for the purposes of this invention. i

In Figs. 10, 11 and 12 we have shown a bolt which maybe inserted from the fire-box side,

to which end the threaded inner end liaof the bolt 5"L is provided with a primarily formed head 6a, which may be suitably constructed to permit of thev application of awrench thereto. AThe forward end of this` bolt is threadedV in rear of the stem or extension 98, as at 26, to receive a separately formed internally threaded'stationary or inner headmember 7a which, when applied tothe boltandV adjusted for a proper seating action, maybe fixed in position in any desired manner. In this construction the outer face of the member 7a is plane-surfaced and a' concavo-con ven plate spring 28 is employed in place of the coiled sprino`-` 23. With these differences,

the construction of the bolt is the .same as the bolts previously described and thev functional qualifications of the bolt .are also the same.

In Figs.`13 and 14 we have shown a modified form of sleeve which kmay be employed with any of the various forms of bolts used,

ofthe plate spring 23a.

in which the sleeve is provided with a tapered passage 15b andin which the outer end 11a of `the sleevevismade with a straight thread to receivek the cap andin which the outer end ofthe'sleeveis made with a 'tapered thread 1lb to fit vwithin acorrespondingly tapered and threaded opening in thefboiler sheet- 2. Y

Otherwise the structure here .shown is or mayv be the same as'thatdisclosed in-F ig. 1. #It will, ofg'course, beA understood that the gaskets and'washers employed may-be of metals i of suitableV degrees' of hardness or softness, and that by making the bushing or outer head member wholly of bearing metalrr the washers may be dispensed with. lll/'e may,

however, asshown in Fig. 15, employ a bushpreciated by those versed in the art without a further and extended, description.' While the structuresdisclosed, for kexemplihcation, arepre'ferredgtwill, of course, be understood that our new staybolt-may be used in practically all sleeves of conventional type now in use and that many changes in the form.

proportion, constructioman'd arrangement of parts, other than those disclosed, may 'be ymade within the scope of the claims' without 'departing from the spirit or sacriiicing any ofthe advantages of the invention.

l Having `thus fully described our invention,

we claim :-v` Y nl. `In a staybolt structure, a casing comprising afsleeve and cap having outer and inner spherical seatsurfaces, and said cap havingWan opening in its outer wall concentric with itsseat surface, a bolt having an end pori tion disposed 1n said casingand provided with an inner head member having a spherical seat i :surface pivot-allyvengaging the seat surface gof the sleeve, an axial extension projecting 'beyond saidV inner head member'and projecting outwardly through the opening in the cap, the bolt and its extension being provided with a tell-talehole` extending continuously from endlto end thereof, an outer head member slidable on the bolt extension toward and from the inner head member and having a spherical seat surface pivotally'engaging the seat surface ofthecap, and spring-pressed means acting to force the youter head member outward and away from the inner head member and against said seat surface of the cap,

f tion of the bolt without compression of.` the spring or causingseparation of thek joint f l closingginembers. ,i Y Y 2.' In a staybolt "structure, ya casing com. i j prisinga sleeveand cap having outerandin-.

- ner spherical seatsurfaces, and said cap havf ving anV opening inits outer wall7 concentric y i v,with its seat surface,fa bolt having anfendr "portion disposed in said casingfandfprovided with an innerheadjmember having a sphel` l 'i ical, seat surface pivotally Vengaging the'seat I surface of the sleeve, `an--integrala2ial extern y .Y sion projecting beyond said inner.head'm'enly-y extensionbeing provided with af'tell-,tale hole ber and projecting outwardly through thei i opening inthe cap,H the bolt and its integrali."

extending, continuouslyffrom n, end to endgV l n kthereof, an outer `heaifl member ,slidableong fthe bolt extenslon'towardjand"from'the in-V l @ner head memberandhavinga spherical seat Jsurface rpivotally` engaging `the, vseat surface V"of the cap, a packingmemberjfor closing the joint between the boltl 'extension and outer j lihead member, and aspring'forfpressing the. packingagainst the outer head member fands acting to `Aforce the'outer yhead member :outi-` Ward and away from'th inner head member? "and against said seat ysurface'of thecapg'the j said outer and inner sphericalseat surfaces j v y lof the sleeve and capjand coacting spherical seat surfaces of the -'outen andfinner Vhead members being fformedon ar'cs described'` f from a commoncenterwhereby thefjsleeve and cap provide a ballj andV socket connection allowingV yuniversalflateraloscillation of ,the

bolt without :compression of thespringl or i vausing separation ofthe joint closing meme ers. i n j' g l,In testimonyy whereof We aiix ourgsi'gnaf tures'. Y n. fr" t V'FREDliRlCKl-L E IHWECHTER,TJL aiinrris.;Malak. i y 

